feat: 完成 B 群組 — 資料層與核心領域模型

- 導入 Prisma 7.9.1 + SQLite（better-sqlite3 driver adapter），prisma.config.ts 管理連線設定
- 完整資料模型：User／Work／Character／CharacterAlias／EpisodicMemory／SemanticMemory／
  ProceduralRule／EmotionState／Relationship／SentimentLedgerEntry
- packages/db：Prisma Client 存取層（ESM，因 Prisma 7 產出的 generated client 僅支援 ESM）
- apps/api 隨之改為 ESM 以相容 packages/db
- packages/shared：新增角色／記憶／情緒／關係共用型別，api 與 web 皆從此匯入
- prisma/seed.ts：建立測試使用者與元氣型測試角色，含完整關係帳本與記憶種子資料
- apps/api：新增 GET /characters
- scripts/smoke/B.mjs：驗證資料表齊全、API 讀出種子角色、關係與記憶可寫入讀出
- 保留 Prisma 官方隨 CLI 附的 agent skill 文件（.agents/skills 等），供後續群組查閱

npm run restart && npm run smoke -- B 皆通過（B-V），A 群組冒煙測試無回歸。

.agents/skills/prisma-database-setup/references/prisma-postgres.md

@@ -0,0 +1,130 @@
+# Prisma Postgres Setup
+
+Configure Prisma with Prisma Postgres (Managed).
+
+## Overview
+
+Prisma Postgres is a serverless, managed PostgreSQL database optimized for Prisma.
+
+## Setup via CLI
+
+You can provision a Prisma Postgres instance directly via the CLI:
+
+```bash
+prisma init --db
+```
+
+This will:
+1. Log you into Prisma Data Platform.
+2. Create a new project and database instance.
+3. Update your `.env` with the connection string.
+
+## Connection String
+
+For Prisma CLI flows and Accelerate-style usage, you may see a `prisma+postgres://` URL.
+
+For Prisma Client with a driver adapter in Node.js, prefer the direct TCP connection string from the Prisma Postgres dashboard:
+
+```env
+DATABASE_URL="postgres://identifier:key@db.prisma.io:5432/postgres?sslmode=require"
+```
+
+## 1. Schema Configuration
+
+In `prisma/schema.prisma`:
+
+```prisma
+datasource db {
+  provider = "postgresql" // Use postgresql provider
+}
+
+generator client {
+  provider = "prisma-client"
+  output   = "../generated"
+}
+```
+
+## 2. Config Configuration
+
+In `prisma.config.ts`:
+
+```typescript
+import { defineConfig, env } from 'prisma/config'
+
+export default defineConfig({
+  schema: 'prisma/schema.prisma',
+  datasource: {
+    url: env('DATABASE_URL'),
+  },
+})
+```
+
+## Driver Adapter
+
+Use a driver adapter for Prisma Postgres in the standard SQL workflow.
+
+### Recommended for standard Node.js apps
+
+1. Install adapter and driver:
+   ```bash
+   npm install @prisma/adapter-pg pg
+   ```
+
+2. Use the direct TCP connection string from Prisma Console:
+   ```typescript
+   import 'dotenv/config'
+   import { PrismaClient } from '../generated/client'
+   import { PrismaPg } from '@prisma/adapter-pg'
+
+   const adapter = new PrismaPg({ connectionString: process.env.DATABASE_URL })
+   const prisma = new PrismaClient({ adapter })
+   ```
+
+`PrismaPg` also accepts the connection string directly:
+
+```typescript
+const adapter = new PrismaPg(process.env.DATABASE_URL!)
+const prisma = new PrismaClient({ adapter })
+```
+
+For PostgreSQL prepared statement naming, pass adapter options as the second argument:
+
+```typescript
+import { createHash } from 'node:crypto'
+
+const adapter = new PrismaPg(process.env.DATABASE_URL!, {
+  statementNameGenerator: ({ sql }) =>
+    `prisma_${createHash('sha1').update(sql).digest('hex').slice(0, 16)}`,
+})
+```
+
+### Edge/serverless option
+
+Use the Prisma Postgres serverless driver only when you need HTTP/WebSocket transport in environments like Workers or Edge Functions:
+
+```bash
+npm install @prisma/adapter-ppg @prisma/ppg
+```
+
+```typescript
+import { PrismaClient } from '../generated/client'
+import { PrismaPostgresAdapter } from '@prisma/adapter-ppg'
+
+const prisma = new PrismaClient({
+  adapter: new PrismaPostgresAdapter({
+    connectionString: process.env.PRISMA_DIRECT_TCP_URL,
+  }),
+})
+```
+
+This serverless driver is the specialized path for HTTP/WebSocket-based edge and serverless runtimes, not the default recommendation for standard Node.js apps.
+
+## Features
+
+- **Serverless**: Scales to zero.
+- **Caching**: Integrated query caching (Accelerate).
+- **Real-time**: Database events (Pulse).
+
+## Using with Prisma Client
+
+Use the Prisma Postgres adapter shown above when instantiating Prisma Client.